Digital Signal ControllersのトピックRe: TJA1043 and TJA1044 power supply sequence https://community.nxp.com/t5/Digital-Signal-Controllers/TJA1043-and-TJA1044-power-supply-sequence/m-p/834689#M1394 <HTML><HEAD></HEAD><BODY><P>Hello</P><P>I believe that it does not matter. the VIO feed the bus output section. This side should be protected, as it is possible that the CAN bus side is on power, while the chip circuit PS is off, and it cause no damage.</P><P>So actually, if you feed the VIO first, is the same as connecting the can bus while circuit power is off, and it cause no damage.</P><P>In my design circuits, the 3V is generated from the 5V, which cause a short delay on the 3V PS. Never had problems with the CAN bus.</P><P>Ben</P></BODY></HTML> Sat, 20 Oct 2018 22:03:49 GMT Ben 2018-10-20T22:03:49Z TJA1043 and TJA1044 power supply sequence https://community.nxp.com/t5/Digital-Signal-Controllers/TJA1043-and-TJA1044-power-supply-sequence/m-p/834688#M1393 <HTML><HEAD></HEAD><BODY><P>I want to use TJA1043 and TJA1044 as CAN transcivers. The pin VIO is powered by 3.3V, the pin VCC is powered by 5V,&nbsp; I want to know the power-up sequence between 5V and 3.3V.&nbsp; whether&nbsp;5V first ,3.3V second&nbsp;or&nbsp;3.3V&nbsp;first, 5V second.&nbsp; Thank you!</P></BODY></HTML> Mon, 08 Oct 2018 02:46:49 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/TJA1043-and-TJA1044-power-supply-sequence/m-p/834688#M1393 ypchang 2018-10-08T02:46:49Z Re: TJA1043 and TJA1044 power supply sequence https://community.nxp.com/t5/Digital-Signal-Controllers/TJA1043-and-TJA1044-power-supply-sequence/m-p/834689#M1394 <HTML><HEAD></HEAD><BODY><P>Hello</P><P>I believe that it does not matter. the VIO feed the bus output section. This side should be protected, as it is possible that the CAN bus side is on power, while the chip circuit PS is off, and it cause no damage.</P><P>So actually, if you feed the VIO first, is the same as connecting the can bus while circuit power is off, and it cause no damage.</P><P>In my design circuits, the 3V is generated from the 5V, which cause a short delay on the 3V PS. Never had problems with the CAN bus.</P><P>Ben</P></BODY></HTML> Sat, 20 Oct 2018 22:03:49 GMT https://community.nxp.com/t5/Digital-Signal-Controllers/TJA1043-and-TJA1044-power-supply-sequence/m-p/834689#M1394 Ben 2018-10-20T22:03:49Z